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@PHDTHESIS{Fuest:1010022,
      author       = {Fuest, Hendrik},
      othercontributors = {Moormann, Dieter and Schmehl, Roland},
      title        = {{L}aunch trajectory control of a flying wing with vertical
                      takeoff capability for airborne wind energy systems},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2025-03802},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2025},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, Rheinisch-Westfälische Technische
                      Hochschule Aachen, 2025},
      abstract     = {Airborne wind energy (AWE) is an emerging technology that
                      harnesses wind power using tethered flight systems. Maximum
                      power output is sought out for operations ranging from low
                      to high wind velocities. A flying wing is a promising
                      airborne wind energy flight system since it is reduced to
                      the wing as the primary lift-generating component to achieve
                      a highly efficient, aerodynamic flight. For takeoff within a
                      limited space, the flying wing is capable of vertical
                      takeoff in a tailsitter configuration. This thesis presents
                      a trajectory controller that controls the aerodynamic
                      velocity of the flying wing from vertical hover to
                      horizontal forward flight while maintaining a constant
                      height. This flight trajectory marks the beginning of the
                      launching phase of the airborne wind energy system, which
                      places high demands on the flight controller for low power
                      consumption and particularly high wind robustness. The
                      flight controller achieves a thrust-efficient launch
                      trajectory with sufficient control reserves for operations
                      including a dynamic wind field. It incorporates the specific
                      constraints imposed by the tether connection and the limited
                      flight envelope of the flight system. The stabilization of
                      the natural instabilities of the flight system's attitude is
                      a necessary criterion that is inherently integrated into the
                      control architecture. A straight flight path along the wind
                      vector with a yaw-roll motion is outlined as a solution to
                      keep the flight system within controllable limits. Based on
                      a detailed analysis of trim states, the operating points
                      from vertical takeoff to horizontal forward flight are
                      carefully selected under consideration of control reserves
                      and thrust requirements. The focus is on the velocity
                      controller, which employs LQR control and integrates all
                      flight axes to explicitly control the velocities along this
                      selected flight path of commanded operating points. The
                      launch trajectory controller enables dynamic operation and
                      adapts the orientation of the flight system to a rotating
                      wind vector to maintain flight within the flight envelope.
                      The trajectory controller is thoroughly validated using
                      nonlinear simulation results. Accurate disturbance rejection
                      in response to a rotating wind field is in particular
                      decisive during the initial hover flight phase. Simulation
                      and flight test results demonstrate the effectiveness of the
                      flight trajectory controller during this flight phase under
                      wind conditions, which is complemented by a robustness
                      analysis to verify stable flight.},
      cin          = {415410},
      ddc          = {620},
      cid          = {$I:(DE-82)415410_20140620$},
      pnm          = {Verbundvorhaben: EnerGlider - Entwicklung einer Offshore
                      Höhenwindanlage auf Basis eines eigenstart- und
                      eigenflugfähigen Gleiters; Teilvorhaben: Entwicklung und
                      Erprobung des automatisierten Flugbetriebs (0324339D)},
      pid          = {G:(BMWK)0324339D},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2025-03802},
      url          = {https://publications.rwth-aachen.de/record/1010022},
}